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Commitments and Contingencies - Series A Convertible Redeemable Preferred Stock Offering (Details) - USD ($) |  |  | 2 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 23, 2018 | Feb. 06, 2017 | Jan. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Proceeds from issuance of convertible redeemable preferred stock, net of issuance costs |  |  |  | $ 0 | $ 55,290,000 |
Payment of dividends on Series A Preferred Stock |  |  |  | 9,719,000 | $ 0 |
Series A Convertible Redeemable Preferred Stock |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Accretion of redeemable noncontrolling interests and equity |  |  |  | 57,324,000 |  |
Total redeemable noncontrolling interests and equity |  |  |  | 447,881,000 |  | $ 400,276,000
Series A Convertible Redeemable Preferred Stock | Additional paid-in capital |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Accretion of redeemable noncontrolling interests and equity |  |  |  | 57,324,000 |  |
Series A Redeemable Convertible Preferred Stock - Beneficial Conversion Feature |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Accretion of redeemable noncontrolling interests and equity |  |  |  | $ (265,368,000) |  |
Series A Redeemable Convertible Preferred Stock - Beneficial Conversion Feature | Additional paid-in capital |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Accretion period |  |  |  | 1 year |  |
Series A Preferred Stock |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Payment of dividends on Series A Preferred Stock |  |  |  | $ 9,719,000 |  |
Class A Common Stock |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Common stock, par value (in dollars per share) |  | $ 0.004 |  | $ 0.004 |  | $ 0.004
Private Placement | Series A Convertible Redeemable Preferred Stock |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Sale of stock, number of shares agreed to be issued in transaction (in shares) |  |  | 400,000 |  |  |
Proceeds from issuance of convertible redeemable preferred stock, net of issuance costs |  |  | $ 400,000,000 |  |  |
Period for conversion of stock after first anniversary of initial public offering |  | 1 day |  |  |  |
Subsequent Event | Class A Common Stock |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.004 |  |  |  |  |
Subsequent Event | Private Placement | Series A Convertible Redeemable Preferred Stock |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Number of shares converted (in shares) | 36,143,000 |  |  |  |  |

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- Definition Amount of decrease (increase) in additional paid in capital (APIC) for the increase in carrying amount of redeemable preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 3.C) -URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177168-122764 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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